Sound-box for talking-machines.



L. BINEHART. SOUND BOX FOR TALKING MACHINES. APPLICATION FTLBD DEC. 22, 1905.

13 314 Patented Jan. 2, "1912.

WITNESSES: JMENTOI? gdgg fienfmgl .fifuz 6// (1/1. 27

ATTORNEY.

UNITED STATES PATENT OFFICE. I

BENTLEY L. RINEHART, OF CAMDEN, NEW JERSEY, ASSIGNOR TO VICTOR TALKING MACHINE COMPANY, A CORPORATION OF NEW JERSEY.

SOUND-BOX FOR TALKING- MACHINES.

To all whom it may concern:

Be it known that I, BENTLEY L. RINE- HART, a citizen of the United States, and

a resident of the city of Camden, county of Camden, State of New J ersey,have invented a sound box in which the quality and volume of the tone of reproduction is rendered clearer, more'distinct and more natural than it has heretofore been possible to do.

A further object of my inventlon 1s to dispose a simple spring support for a stylus bar in such a manner that the quality of the reproduction is greatly improved.

A further object of my invention is to provide a construction in which the diaphragm may be readily adjusted with respect to the stylus bar and, when adjusted, may be held between the elastic gaskets by a pressure which may be varied to secure the best results in the recording or reproducing of sound.

Briefly my invention consists in'mounting thestylus bar on a flat spring which in turn is secured to a suitable supporting plate, the said spring between its points of support being buckled or slightly sprung away from the supporting plate and having its longitudinal axis perpendicular to the plane of the diaphragm and lying within the plane of the oscillation of the stylus bar.

In the accompanying drawings forming a part of this specification, Figure 1 shows a sound box having my improved stylus spring secured thereto; Fig. 2 is a longitudinal section of a sound box containing my invention, taken on the line 2-2 and Figs. 3 and 4 are detail views showing the stylus bar and its support detached from the sound box casing.

1 indicates a cylindrical casing of a sound box provided on the back side thereof with an opening 2, connected with' the sound tube 3 secured to the back of said sound box by screws 4 passing through the elastic mount- Specification of Letters Patent.

Patented J an. 2, 1912.

Application filed December 22, 1905. Serial No. 292,918.

ing 5 on the outside of said sound tube. Into the front side of the cylindrical casing 1, the face plate 6 is secured by threads? within the casing and upon the outside of the body of the face plate. The outer flange of the face plate is provided with a knurled surface 6 in order. that the same may be rotated with facility.

8 indicates a seat, within the casing, for one of the elastic gaskets 9 and 10 between which the diaphragm 11 is held.

1.2 indicates a follower or bushing which is adapted to engage the gasket 10 and the inner side of the face plate 6 when the face plate is screwed into the front side of the casing.

On one side of the sound box, is secured, in any suitable manner, a support-ing plate 13, provided with threaded holes 14-.

15 indicates the supporting spring upon which the stylus bar 16 is mounted, said spring consisting of a comparatively thin and narrow strip of any suitable spring metal provided in the middle and at the ends thereofwith holes 17 and 18l8. The distance between the holes 1818 of the spring, is a little greater than the distance between the holes l t-14 of the support, so that when the spring is secured to the sup port by screws 19 passing through the holes 18 and into the threaded holes 14:, the spring will be buckled or sprung away from the support. The stylus bar is held within the hole 17 of the spring in any suitable manner as by being tightly forced into the same or soldered therein and the inner end of the stylus bar will projectthrough the hole 20,

of the casing, and 21, of the bushing or follower, to a position near the center of the diaphragm to which it is adapted to be attached through the connection 22. The outer end of the stylus bar is provided with a socket 23 into which the stylus may be inserted and clamped by the set screw 24.

By reason of the above construction I am enabled to apply a greater or lesser pressure to the-edges of the diaphragm in order to secure the best results in recording and reproducing sound, by merely rotating the face plate to move the same toward or away from the diaphragm, and to mountt-he stylus bar on a yielding support in such a manner that the plane of the oscillation of the stylus bar will pass through the axis of the spring, the axis of the spring being also perpendicular to the plane of the diaphragm. This relation between the spring and the stylus bar results in a pure and loud reproduction-of the sound and alfords a simple and effective way of mounting the stylus bar. Moreover, the pressure applied to the edge of the diaphragm may be easily adjusted or varied to suit varying conditions. Having thus described my invention,

I what I claimand desire to protect by Letters Patent of the United States, is

1. In a sound box for talking machines,

the combination ofa stylus bar, a, spring support therefor and a spring supporting plate, said spring and said plate having holesnear the ends thereof, the distance between the holes .in the spring being normally, greater than that between the holes in the plate, and means for; securing said spring and said plate with the holes in the spring;

registering with the holes in the plate.

2. In a sound box for talking machines, the combination with a stylus bar, of a spring supporting plate extending parallel with the axis of said sound box, and a recurved spring secured at its ends to said supporting plate'and capable of being variably buckled centrally away from its line of support and having its longitudinal axis perpendicular to the plane of the diaphragm for supporting said stylus bar.

3. In a sound box for talking machines, the'combination with a diaphragm, of a stylus bar, a buckled spring upon which said bar is mounted, the longitudinal axis of the said springibeing perpendicular to the plane of the diaphragm, and a support for said spring,-said spring being buckled centrally away from said support and adjustable to vary its tensibility.

4. In a's'ound box for talking machines the combination with a stylus bar, of a' spring supporting plate extending parallel to the axis of the sound box, and a recurved spring secured at its ends to said supporting plate and capable of being variably buckled centrally away from its line of support, and

having its longitudinal axis perpendicular to the plane of the diaphragm, for supporting the stylus bar.

5'. In a sound box for talking machines,

the combination of a stylus bar, a spring and adjustable to variably buck support therefor, a spring supporting plate,

said spring being longer than said plate,

and means for securing the spring to they plate with their ends in alinement, the said sprin being buckled centrally away from the line between the points at which it is secured to said plate, said securing means being adjustableto vary the'tensibility of said spring.

6. In asound box, the combination with a stylus, of a spring support therefor, a

spring supporting plate, the ends of said spring support belng secured to the plate, and the central portlon of said spring support being sprung away from the said plate, and means distinct from said plate arranged to secure said spring thereto.

7. In a sound box, the combination with a stylus bar, of a spring support therefor, a

spring supporting plate having a fiat surse'cured to the saidflat surface, and the central portion of said spring support being face, the ends of said spring support being sprung away from said plate, and adjustable I means arranged to securesaid spring to said late. 1 p 8. In a. sound box, the combination with a stylus bar, of a spring support therefor extending radially in opposite directions from said bar, a-spring supporting plate provided with an aperture, said bar extending through said aperture, the ends of said spring support having apertures registerable with apertures in said plate, when the my hand this nineteenth day of December,-

' TlidllTTLEY L. RINEHART.

Witnesses:

WM. Emm

Cnas. K. BENNET'I. 

